6989953397904 has 135 divisors (see below), whose sum is σ = 19943020183723. Its totient is φ = 2285472573696.

The previous prime is 6989953397849. The next prime is 6989953397927. The reversal of 6989953397904 is 4097933599896.

The square root of 6989953397904 is 2643852.

It is a perfect power (a square), and thus also a powerful number.

6989953397904 is a `hidden beast` number, since 6 + 9 + 8 + 9 + 9 + 533 + 9 + 79 + 0 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 234112757904 + 6755840640000 = 483852^2 + 2599200^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1681487794 + ... + 1681491950.

Almost surely, 2^{6989953397904} is an apocalyptic number.

6989953397904 is the 2643852-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6989953397904

6989953397904 is an abundant number, since it is smaller than the sum of its proper divisors (12953066785819).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6989953397904 is an frugal number, since it uses more digits than its factorization.

6989953397904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8434 (or 4215 counting only the distinct ones).

The product of its (nonzero) digits is 3571283520, while the sum is 81.

Multiplying 6989953397904 by its sum of digits (81), we get a square (566186225230224 = 23794668²).

The spelling of 6989953397904 in words is "six trillion, nine hundred eighty-nine billion, nine hundred fifty-three million, three hundred ninety-seven thousand, nine hundred four".